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        <p>记录一下自己面试遇到的问题和心得</p>
<a id="more"></a>

<iframe frameborder="no" border="0" marginwidth="0" marginheight="0" width="330" height="86" src="//music.163.com/outchain/player?type=2&id=65555&auto=1&height=66"></iframe>

<p>我找工作的时间范围在2019年10月13日至11月22日，此时工作年限四年零七个月。</p>
<h3 id="先说几个重点"><a href="#先说几个重点" class="headerlink" title="先说几个重点"></a>先说几个重点</h3><p>1、简历一定要写好，我整理简历花了两三天的时间，差点吐了，用到的网站有</p>
<p><a href="https://github.com/geekcompany/ResumeSample" target="_blank" rel="noopener">https://github.com/geekcompany/ResumeSample</a></p>
<p><a href="https://github.com/resumejob/awesome-resume" target="_blank" rel="noopener">https://github.com/resumejob/awesome-resume</a></p>
<p>2、投简历之前花个三四天的时间全局复习一下，我主程序Java，复习看的是这个</p>
<p><a href="https://github.com/Snailclimb/JavaGuide" target="_blank" rel="noopener">https://github.com/Snailclimb/JavaGuide</a></p>
<p>3、前期先投些小规模的公司，自己心仪的公司中前期投，因为大公司的流程比较慢，比如阿里的投了简历，筛选到电话面试大概需要十天吧</p>
<p>4、一定要把每场面试不会或不熟的知识点记录并总结(不是背答案，要理解记忆，实在理解不了，那就如是说不会)，多面几次，你会发现就那么几个主要的问题</p>
<p>5、不管怎样，先拿到offer再说，越多越好，横向比较一下，选出最心仪的offer。</p>
<p>6、不要以为拿了offer就能放松了，有些公司后面可能会有其他的流程，比如测评、体检之类的，测评不过的也会pass掉你，体检未达到公司指标的也会pass掉(虽说法律禁止，但是有的公司很拽，懂的人都懂)，最终在你入职签订劳动合同的时候再去放松吧。</p>
<h3 id="面试问到的问题"><a href="#面试问到的问题" class="headerlink" title="面试问到的问题"></a>面试问到的问题</h3><blockquote>
<p>说明一下， 以下只是问到我的问题</p>
</blockquote>
<h4 id="Java"><a href="#Java" class="headerlink" title="Java"></a>Java</h4><ul>
<li><p>HashMap源码分析</p>
</li>
<li><p>ConcurrentHashMap源码分析 </p>
</li>
<li><p>为什么要重写hashcode</p>
</li>
<li><p>线程池工作的原理及参数的含义</p>
</li>
<li><p>CountDownLatch、CyclicBarrier 原理和区别</p>
</li>
<li><p>Volatile作用</p>
</li>
<li><p>synchronized 与 lock 的区别</p>
</li>
<li><p>常见的原子操作类</p>
</li>
<li><p>偏向锁、轻量级锁、重量级锁、自旋锁的概念</p>
</li>
<li><p>class.forname与classloader的区别</p>
</li>
<li><p>集合sort的底层原理</p>
</li>
<li><p>JDK中用到的设计模式</p>
</li>
<li><p>如何快速计算出一个数是否为2的n次方</p>
</li>
<li><p>如何实现热部署</p>
</li>
</ul>
<h4 id="JVM"><a href="#JVM" class="headerlink" title="JVM"></a>JVM</h4><ul>
<li>JVM内存模型</li>
<li>垃圾回收</li>
<li>一些常见的参数</li>
<li>如何解决献上CPU 100%的问题(发现到定位代码)</li>
<li>类加载器、为什么是父类委派</li>
<li>JMM的设计初衷与好处</li>
<li>类文件加载过程</li>
<li>JVM中对象的组成</li>
</ul>
<p>程序员必回必问，多看书多实践，不要为了面试去看</p>
<h4 id="网络"><a href="#网络" class="headerlink" title="网络"></a>网络</h4><ul>
<li>Http和Https的却比</li>
<li>Http与RPC的区别</li>
</ul>
<h4 id="Linux"><a href="#Linux" class="headerlink" title="Linux"></a>Linux</h4><ul>
<li>常用参数</li>
</ul>
<h4 id="Mysql"><a href="#Mysql" class="headerlink" title="Mysql"></a>Mysql</h4><ul>
<li>整数类型有几种</li>
<li>存储引擎的 InnoDB 与 MyISAM 区别、优缺点、使用场景</li>
<li>索引类型与区别</li>
<li>为什么使用B+树做索引结构</li>
<li>聚簇索引与非聚簇索引的区别</li>
<li>为什么是最左匹配原则</li>
<li>什么是覆盖索引</li>
<li>索引创建原则</li>
<li>UUID适合做索引吗</li>
<li>B+树的一个节点所占用大小(可以推算出一个节点能存储多少行数据)</li>
<li>SQL的优化，explain后出现各field代表的含义</li>
<li>隔离级别</li>
<li>锁机制</li>
</ul>
<h4 id="MQ"><a href="#MQ" class="headerlink" title="MQ"></a>MQ</h4><ul>
<li>项目中用到的MQ，目前市面上MQ的比较</li>
<li>Rabbitmq的组件与应答机制</li>
<li>Rabbitmq的通信协议，一个消息如何发送存储和消费</li>
<li>如何保证消息不丢失</li>
<li>如何保证消息不重复</li>
<li>exchange routekey queue关系</li>
</ul>
<h4 id="Redis"><a href="#Redis" class="headerlink" title="Redis"></a>Redis</h4><ul>
<li>持久化方式、各自的优缺点</li>
<li>集群类型</li>
<li>为什么是单线程</li>
<li>如何实现原子性操作</li>
<li>数据类型</li>
<li>缓存雪崩、穿透、击穿的含义及解决方案</li>
</ul>
<h4 id="ElasticSearch"><a href="#ElasticSearch" class="headerlink" title="ElasticSearch"></a>ElasticSearch</h4><ul>
<li>什么是倒排索引</li>
<li>为什么搜索能那么快</li>
<li>集群介绍，各名词如主副节点、分片、副本等</li>
<li>如何解决脑裂的问题</li>
<li>文档索引过程</li>
<li>文档搜索过程</li>
<li>索引的优化</li>
</ul>
<h4 id="SpringBoot"><a href="#SpringBoot" class="headerlink" title="SpringBoot"></a>SpringBoot</h4><ul>
<li>controller是否为单例，如何保证多线程下安全</li>
<li>如何解决循环依赖</li>
<li>涉及到的设计模式</li>
<li>代理的实现</li>
<li>IOC过程，越详细越好(这个可真是凭真功夫，因为随便一个点都能牵扯出一系列的问题)</li>
<li>springboot如何做到自动配置</li>
<li>springboot启动过程</li>
</ul>
<h4 id="Mybatis"><a href="#Mybatis" class="headerlink" title="Mybatis"></a>Mybatis</h4><ul>
<li><code>#</code>与<code>$</code>的区别</li>
<li>如何实现xml与接口绑定</li>
</ul>
<h4 id="其他"><a href="#其他" class="headerlink" title="其他"></a>其他</h4><p>其他的就是按照你简历中涉及到的一些功能点去问，非常有感触的是蚂蚁金服的电话面试，只问你用过的，然后不停的深入深入再深入，直到你回答不上来，所以，简历上写的一定要是很熟练的；</p>
<p>还有一般都会问你项目中解决过的重大问题，思路啊、实施过程等等，个人感觉这里考察就是表达能力和解决问题的能力，或者跨部门协调的问题等等，一般是在负责人面试的时候会被问到，最好也需要提前整理一下；</p>
<h3 id="投简历渠道"><a href="#投简历渠道" class="headerlink" title="投简历渠道"></a>投简历渠道</h3><p>这次面试主要用的是Boss直聘和拉勾网还有一些猎头的推荐，猎聘和前程无忧不敢用，生怕刷新简历电话会被打到爆。。。特别是那些外包的公司</p>
<h3 id="最后"><a href="#最后" class="headerlink" title="最后"></a>最后</h3><p>一定要放平心态，不要太紧张，就当一次技术交流，看过一哥们在博客中写道</p>
<blockquote>
<p>面试是一种蜕变</p>
</blockquote>
<p>就当是对以往能力的一次检验，顺便做个查缺补漏，最后祝大家都能进入自己心仪的公司！</p>

      
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  <p><span>本文标题:</span><a href="/2019/11/25/1/">2019程序员个人面试随笔</a></p>
  <p><span>文章作者:</span><a href="/" title="访问 wangxc 的个人博客">wangxc</a></p>
  <p><span>发布时间:</span>2019年11月25日 - 22:11</p>
  <p><span>最后更新:</span>2019年11月25日 - 22:11</p>
  <p><span>原始链接:</span><a href="/2019/11/25/1/" title="2019程序员个人面试随笔">http://blog.wangxc.club/2019/11/25/1/</a>
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